<template>
  <div class="component-upload-image">
    <el-upload multiple :auto-upload="autoUpload" :action="uploadImgUrl" list-type="picture-card"
      :on-success="handleUploadSuccess" :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError"
      :on-exceed="handleExceed" ref="upload" :on-remove="handleDelete" :show-file-list="true" :headers="headers"
      :file-list="fileList" :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }">
      <i class="el-icon-plus"></i>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
      的文件
    </div>

    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    autoUpload: {
      type: Boolean,
      default: false
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + "/common/upload", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: []
    };
  },
  // watch: {
  //   value: {
  //     handler(val) {
  //       if (val) {
  //         // 首先将值转为数组
  //         const list = Array.isArray(val) ? val : this.value.split(',');
  //         // 然后将数组转为对象数组
  //         this.fileList = list.map(item => {
  //           if (typeof item === "string") {
  //             if (item.indexOf(this.baseUrl) === -1) {
  //               item = { name: this.baseUrl + item, url: this.baseUrl + item };
  //             } else {
  //               item = { name: item, url: item };
  //             }
  //           }
  //           return item;
  //         });
  //       } else {
  //         this.fileList = [];
  //         return [];
  //       }
  //     },
  //     deep: true,
  //     immediate: true
  //   }
  // },
  //这是后期修改组件之后的代码
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 确保 val 是数组
          const list = Array.isArray(val) ? val : val.split(',');
          // 将数组转换为文件列表
          this.fileList = list.map(item => {
            if (typeof item === "string") {
              const url = item.startsWith('http') ? item : this.baseUrl + item;
              return { name: url, url: url };
            }
            return item;
          });
        } else {
          this.fileList = [];
        }
      },
      deep: true,
      immediate: true
    }
  },

  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    //个人修改组件新增代码
    submitUpload() {
      return new Promise((resolve, reject) => {
        if (this.$refs.upload) {
          const filesToUpload = this.$refs.upload.uploadFiles.filter(file => file.status === 'ready');
          if (filesToUpload.length > 0) {
            this.uploadPromiseResolve = resolve;
            this.uploadPromiseReject = reject;
            this.$refs.upload.submit();
          } else {
            // 没有文件需要上传，立即 resolve
            resolve();
          }
        } else {
          resolve();
        }
      }).catch(error => {
        // 上传失败时，阻止表单提交
        this.$message.error("图片上传失败，请检查图片格式和大小");
        return Promise.reject(error); // 阻止表单提交
      });
    },

    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isImg = file.type.indexOf("image") > -1;
      }

      if (!isImg) {
        this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`);
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传图片，请稍候...");
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.uploadList.push({ name: res.fileName, url: res.fileName });
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.imageUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除图片
    // handleDelete(file) {
    //   const findex = this.fileList.map(f => f.name).indexOf(file.name);
    //   if (findex > -1) {
    //     this.fileList.splice(findex, 1);
    //     this.$emit("input", this.listToString(this.fileList));
    //   }
    // },
    // 删除图片(这是后期修改组件的代码)
    // handleDelete(file) {
    //   const findex = this.fileList.map(f => f.name).indexOf(file.name);
    //   if (findex > -1) {
    //     this.fileList.splice(findex, 1);
    //     // 删除后，直接传递数组形式的图片路径列表
    //     const imagePaths = this.fileList.map(file => file.url.replace(this.baseUrl, ''));
    //     this.$emit("input", imagePaths);
    //   }
    // },
    handleDelete(file) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        // 从 uploadFiles 中移除
        const uploadIndex = this.$refs.upload.uploadFiles.findIndex(f => f.uid === file.uid);
        if (uploadIndex > -1) {
          this.$refs.upload.uploadFiles.splice(uploadIndex, 1);
        }
        // 更新父组件的数据
        const imagePaths = this.fileList.map(file => file.url.replace(this.baseUrl, ''));
        this.$emit("input", imagePaths);
      }
    },

    // 上传失败
    // handleUploadError() {
    //   this.$modal.msgError("上传图片失败，请重试");
    //   this.$modal.closeLoading();
    //   // 调用 reject，表示上传失败
    //   if (this.uploadPromiseReject) {
    //     this.uploadPromiseReject(err);
    //     this.uploadPromiseReject = null; // 清空，防止重复调用
    //   }
    // },
    handleUploadError() {
      this.$modal.msgError("上传图片失败，请重试");
      this.$modal.closeLoading();
      // 调用 reject，表示上传失败
      if (this.uploadPromiseReject) {
        this.uploadPromiseReject(new Error('上传失败'));
        this.uploadPromiseReject = null; // 清空，防止重复调用
      }
    },

    //个人修改组件代码
    uploadedSuccessfully() {
      // 调整条件，处理没有上传文件的情况
      if (this.number === 0 || (this.number > 0 && this.uploadList.length === this.number)) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        const imagePaths = this.fileList.map(file => file.url.replace(this.baseUrl, ''));
        this.$emit("input", imagePaths);
        this.$modal.closeLoading();
        this.$nextTick(() => {
          if (this.uploadPromiseResolve) {
            this.uploadPromiseResolve();
            this.uploadPromiseResolve = null;
          }
        });
      }
    },

    // 上传结束处理
    // uploadedSuccessfully() {
    //   if (this.number > 0 && this.uploadList.length === this.number) {
    //     this.fileList = this.fileList.concat(this.uploadList);
    //     this.uploadList = [];
    //     this.number = 0;
    //     // 直接传递数组形式的图片路径列表（这是后期修改组件的代码）
    //     const imagePaths = this.fileList.map(file => file.url.replace(this.baseUrl, ''));
    //     this.$emit("input", imagePaths);
    //     this.$modal.closeLoading();


    //     // this.$emit("input", this.listToString(this.fileList));
    //     // this.$modal.closeLoading();

    //     //个人修改组件新增代码
    //     this.$nextTick(() => {
    //       if (this.uploadPromiseResolve) {
    //         this.uploadPromiseResolve();
    //         this.uploadPromiseResolve = null;
    //       }
    //     });
    //   }
    // },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    // listToString(list, separator) {
    //   let strs = "";
    //   separator = separator || ",";
    //   for (let i in list) {
    //     if (list[i].url) {
    //       strs += list[i].url.replace(this.baseUrl, "") + separator;
    //     }
    //   }
    //   return strs != '' ? strs.substr(0, strs.length - 1) : '';
    // },
  }
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>
